package cn.mf.hrm.web.controller;

import cn.mf.hrm.properties.AlicloudOSSProperties;
import cn.mf.hrm.util.AjaxResult;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

//文件上传
@RestController
@RequestMapping("/file")
public class FileController {

    @Autowired
    private AlicloudOSSProperties properties;

    /**
     * 签名
     */

    @GetMapping("/sign")
    public AjaxResult sign(){

        // host的格式为 bucketname.endpoint
        String host = "https://" + properties.getBucket() + "." + properties.getEndpoint();

        // 用户上传文件时指定的前缀。
        String dir = "mf";

        OSS ossClient = new OSSClientBuilder()
                .build(properties.getEndpoint(), properties.getAccessId(), properties.getAccessKeySecret());

        try {
            long expireTime = 100;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);

            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            Map<String, String> respMap = new LinkedHashMap<String, String>();
            respMap.put("accessid", properties.getAccessId());
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));

            return AjaxResult.me().setResultObj(respMap);

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.getMessage());
        } finally {
            ossClient.shutdown();
        }
        return AjaxResult.me();
    }

}
